# print(1+2-1)
# print(1+2*3)
# print(1+2/3)

# print(( 67.5 + 89.0 + 12.9 + 32.2 ) / 4 )

# avg = (67.5 + 89.0 + 12.9 + 32.2) / 4 #先计算平均值
# total = (67.5 - avg) ** 2 + (89.0 - avg) **2 + (12.9 - avg) **2 + (32.2 - avg) **2 #计算平方和
# result = total / 3 #计算方差
# print(result) #打印结果

# a=10
# print(type(a))
#
# b = 0.7
# print(type(b))
#
# c= 'hello'
# print(type(c))
#
# d = "world"
# print(type(d))
#
# e = 'My name is "LiHua"'
# print(type(e))
#
# f = '''My 'name' is "Lihua"'''
# print(type(f))
#
# print(len(f))
#
# g=c + ' ' + d
# print(g)
#
# h = True
# print(type(h))
# i = False
# print(type(i))

a:int = 10
print(type(a))

a:str = "hello"
print(type(a))

a:bool = True
print(type(a))
